world-family-pool-codec

The groupant beside world/src/family.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.

Facts

Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.

Components

component	label	where
approximant	partial	approximant
ast	partial	`../syntax.json`
composition	partial	composition
cost	partial	cost
descriptant	present	descriptant
invariant	partial	invariant
tests	partial bounded parent tests	tests

Obernants

The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.

id	type	label	where
`behavior_complement`	behavior_complement	partial source derived model	behavior_complement
`reverse_reconstruction`	reverse_reconstruction	partial source derived model	reverse_reconstruction
`world_family_pool_codec_invariants`	world_family_pool_codec_invariants	partial source derived model	world_family_pool_codec_invariants
`world_family_pool_codec_resource_cost`	world_family_pool_codec_resource_cost	partial source derived model	world_family_pool_codec_resource_cost
`world_family_pool_codec_representation_join`	world_family_pool_codec_representation_join	partial source derived model	world_family_pool_codec_representation_join
`world_family_pool_codec_domain_partition`	world_family_pool_codec_domain_partition	partial source derived model	world_family_pool_codec_domain_partition

Model text

descriptant

world-family-pool-codec

idea_key = last segment after ': ' of prefix before ' IF '. change_line encodes add/remove or replace TAB=>TAB. change_scope general iff second column exactly general; change_of unknown nonreplace kind becomes Remove after rule parse.

Modeling epoch 2026-10-31

Prospective source/branch/cost hypotheses were saved externally before source edits. This partial source-derived model retains observed boundaries rather than claiming complete verification. No live channel, exploration, pool/negative-file persistence or state transition evidence; no surrogate.

approximant

Forward relation

Domain: UTF-8 and clean TSV fields; arbitrary injected delimiters not roundtrip-safe.

No executable percent surrogate: these categorical/effect observations lack a useful approximation metric. Future supported caps1/2/5/10% need a defined domain/metric and real reference evidence; no error or speed bound is claimed.

invariant

Generated clean machine lines roundtrip given retained scope. Reversed label direction yields distinct key; semantic feature validation absent.

Cost component: cost.md.

cost

Linear line/atom parsing and string allocation; no pool disk access in codec.

composition

explore grouping uses these lossy pair keys to exclude variants and prioritize at most3 independent pairs.

models

behavior_complement

Malformed replace without separator cannot yield Change. Unknown opcode with valid rule is accepted as Remove. Colon without following space in obl:agent stays in key.

reverse_reconstruction

Same key admits many operation prefixes/IF conditions; Remove admits unknown opcode spellings. Scope is lost in Change, so inverse requires explicit scope parameter.